chore(taxonomy): move ANCHOR.a2ml to .machine_readable/6a2/anchor/ + add 6a2 metadata (batch 8/8)

[hyperpolymath]

Anchor file taxonomy migration: move .machine_readable/anchors/ANCHOR.a2ml -> .machine_readable/6a2/anchor/ANCHOR.a2ml (identical). Plus 2 new metadata files: 0-AI-MANIFEST.a2ml + README.adoc for the .machine_readable/6a2/ directory. Closes M1 foreign-WIP closure (final batch).

[github-actions]

🔍 Hypatia Security Scan

Findings: 134 issues detected

Severity	Count
🔴 Critical	10
🟠 High	24
🟡 Medium	100

⚠️ Action Required: Critical security issues found!

View findings

[
  {
    "reason": "Action perpolymath/standards/.github/workflows/governance-reusable.yml@main\n needs attention",
    "type": "unpinned_action",
    "file": "governance.yml",
    "action": "pin_sha",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Workflow executes remote script directly (curl/wget piped to shell). Download, verify checksum/signature, then execute.",
    "type": "download_then_run",
    "file": "lean-verification.yml",
    "action": "verify_download_integrity",
    "rule_module": "workflow_audit",
    "severity": "high"
  },
  {
    "reason": "Workflow executes remote script directly (curl/wget piped to shell). Download, verify checksum/signature, then execute.",
    "type": "download_then_run",
    "file": "rust-cli.yml",
    "action": "verify_download_integrity",
    "rule_module": "workflow_audit",
    "severity": "high"
  },
  {
    "reason": "Issue in boj-build.yml",
    "type": "missing_timeout_minutes",
    "file": "boj-build.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in casket-pages.yml",
    "type": "missing_timeout_minutes",
    "file": "casket-pages.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in casket-pages.yml",
    "type": "missing_timeout_minutes",
    "file": "casket-pages.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in cflite_batch.yml",
    "type": "missing_timeout_minutes",
    "file": "cflite_batch.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in cflite_pr.yml",
    "type": "missing_timeout_minutes",
    "file": "cflite_pr.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in codeql.yml",
    "type": "missing_timeout_minutes",
    "file": "codeql.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in compilation_tests.yml",
    "type": "missing_timeout_minutes",
    "file": "compilation_tests.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  }
]

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